Communication with I2C for bq34z100

Joel Oliveira

Other Parts Discussed in Thread: BQ34Z100, BQ34Z100-G1, BQ40Z50-R1

Hello

I am developing a system for monitoring multiple batteries. And i need to communicate with multiples bq34z100 in same time. What is the address I2C of each IC bq34z100?
Each battery have address I2C different?

Thank you very much.

over 11 years ago

0 ThomasCosby over 11 years ago

TI__Guru 73830 points

Joel,

The gauge does not offer the option to change the I2C address. It is fixed at AA.

Regards
Tom

0 Joel Oliveira over 11 years ago in reply to ThomasCosby

Prodigy 40 points

Hello Mr. Thomas

I am using a thermistor Semitec 103AT in bq34z100 but the sensor varies dramatically the temperature. For example the sensor is measuring a temperature of 20Cº and the same time its is measure 7Cº. Or measuring 30Cº and a second after it is measuring 10Cº.

Why happens this???

Thank you very much.

0 Paul Harwood over 8 years ago in reply to ThomasCosby

Prodigy 30 points

Thomas thats ridiculous. How are your customers supposed to talk to muliple units?

0 ThomasCosby over 8 years ago in reply to Paul Harwood

TI__Guru 73830 points

Paul
We have implemented the option to change the I2C, or SMBus, address of some devices, but no this one. I have seen people use an I2C multiplexer to support multiple devices.

Tom

0 Paul Harwood over 8 years ago in reply to ThomasCosby

Prodigy 30 points

I still find it ridiculous, I2C is designed as a multi-device bus. I never even considered it would not be this way with this IC. This is really a show-stopper for the application i am developing. Not happy with TI.

0 jury noname over 8 years ago in reply to Paul Harwood

Intellectual 765 points

hmm.. charger and gause make p2p pair.. if you add 2-3 gause - how this chips will talk with charger?
you can use i2c mux f.e. pca9544 - host i2c switch to four i2c buses..

0 Shai Berman over 8 years ago in reply to ThomasCosby

Mastermind 7405 points

Hi Tom,

I have a client who has plans to use BQ34Z100-G1 but according to what I understand, it is not possible to address each battery separately and therefore is no ability to monitor each cell separately.

Can you please recommend me a component that has the ability to change I2C and have equivalent properties of the BQ34Z100-G1 device.

Thanks in advance.

Best Regards.

Shai Berman,

0 ThomasCosby over 8 years ago in reply to Shai Berman

TI__Guru 73830 points

Most of the gauges have fixed SMBus or I2C addresses. The bq40z50-R1 offers the option to change the SMBus address.

0 Shai Berman over 8 years ago in reply to ThomasCosby

Mastermind 7405 points

Thank you very much for your fast reply, I'll overview this solution.
By the way was mentioned the possibility to connect a number of gauges devices with I2C multiplexer,
Can you please share more details about this kind of implementation .
Thanks

BR
Shai Berman

Power management

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Communication with I2C for bq34z100